考虑桩基础柔性的地震风浪作用下海上风力机结构耦合响应机理研究  

RESEARCH OF COUPLING MECHANISMS OF OFFSHORE WIND TURBINES WITH PILE FOUNDATION FLEXIBILITIES UNDER EARTHQUAKE,WIND AND WAVE LOAD

作　　者：柳英洲 王文华 李昕[1,2] 宋雨果 李颖[3] Liu Yingzhou;Wang Wenhua;Li Xin;Song Yuguo;Li Ying(Institute of Earthquake Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Chinese-German Institute of Engineering,Zhejiang University of Science and Technology,Hangzhou 310023,China)

机构地区：[1]大连理工大学建设工程学部抗震研究所,大连116024 [2]大连理工大学海岸与近海工程国家重点实验室,大连116024 [3]浙江科技学院中德工程师学院,杭州310023

出　　处：《太阳能学报》2023年第3期67-76,共10页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(52001052,51909238)。

摘　　要：基于FAST海上风力机整体耦合分析理论和桩基线性化理论,建立包含桩基础柔性的海上风力机基础结构的整体耦合运动方程。进而,通过对FAST v8进行二次开发,同时考虑桩基础柔性,建立包括转子机舱组件-风力机塔筒-基础结构的海上风力机在地震、风、浪荷载作用下的结构耦合仿真模型。根据建立的整体耦合数值仿真模型,开展地震、风、浪荷载联合作用下海上风力机动力响应研究,着重探讨桩基础柔性对于海上风力机结构在地震组合工况下的动力特性及耦合响应机理的影响。结果表明,桩基础柔性对于海上风力机结构动力特性有显著影响。与耦合弹簧边界相比,当忽略桩基础柔性时,会低估整体结构二阶频率对于地震作用下塔顶位移响应的影响,并在基底倾覆力矩响应中激发高阶模态,造成海上风力机结构动力响应变化规律的显著差异。因此,在海上风力机结构抗震设计与研究中必须考虑桩基础柔性的影响。The coupled governing equation of motion of the offshore wind turbine(OWT)substructure with pile foundation flexibilities is established based on the fully coupled analysis theories of the numerical simulation tool FAST and the linearized theories of pile-soil interactions.Then the coupled numerical model of the rotor nacelle assembly,tower and substructure with the flexible boundary conditions(coupled springs)under earthquake,wind and wave loads is established in the updated FAST v8.Based on the established coupled numerical model,the dynamic responses of OWT under the combined actions of earthquake,wind and wave loads are investigated,and the variations of the structural dynamics and coupling mechanisms owing to the pile foundation flexibilities is highlighted.The results prove the significant influence of the pile foundation flexibilities on the structural dynamic characteristics of OWT.The influence of the second modes on the tower top displacements shall be impaired,while with the overestimated contributions of the high order modes on the bending moments at the mudline,if the pile foundation flexibilities are neglected in the seismic analysis of OWT.Sequentially,the remarkable discrepancies of the OWT seismic responses are observed.Hence,the pile foundation flexibilities should be considered in the design and research of OWTs under earthquakes.

关 键 词：海上风力机 桩基础 土-结构相互作用 地震响应 整体耦合模型 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程]